Fastening tool



FIG. 1 is a top/left perspective view of the fastening tool.

FIG. 2 is a front view thereof.

FIG. 3 is a back view thereof.

FIG. 4 is a right view thereof.

FIG. 5 is a left view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a fastening tool, as shown and described. 